<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta charset="UTF-8"/>
    <title>Title</title>
    <style rel="stylesheet" type="text/css">
        @import "003派生选择器.css";
    </style>
</head>
<body>
<p><strong>我是粗体字，不是斜体字，因为我不在列表中，所以这个规则对我不起作用</strong></p>
<ol>
    <li><strong>我是斜体字。这是因为strong元素位于li元素内。</strong></li>
    <li>我是正常的字体。</li>
</ol>
<p>The strongly emphasized word in this paragraph is <strong>red</strong>.</p>
<h2>This subhead is also red.</h2>
<h2>The strongly emphasized word in this subhead is<strong>blue</strong>.</h2>
</body>
</html>